Standard ground mounts for your faction can be bought from race-specific vendors in major cities (e.g., Stormwind for Alliance, Orgrimmar for Horde) at level 20. Reputation & Currency Vendor Mounts
Purchased for 165 Tol Barad Commendations from the Hellscream's Reach (Horde) or Baradin's Wardens (Alliance) quartermasters, requiring Exalted reputation. wow cataclysm buyable mounts
Sold by Mei Francis in Dalaran for 675 gold. Standard ground mounts for your faction can be
Purchased for 200 Tol Barad Commendations from the same PvP quartermasters upon reaching Exalted. Stormwind for Alliance